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Texas Instruments THS4031ID
- Part No.:
- THS4031ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4031ID.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:888
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Product details
Overview
THS4031ID from Texas Instruments is a single-channel, ultra-low-noise (1.2nV/√Hz), high-speed voltage-feedback operational amplifier optimized for precision signal conditioning in wideband, low-distortion applications. It delivers 100MHz bandwidth at G = 2, 100V/μs slew rate, –96dBc THD at 1MHz (RL = 1kΩ), ±13.6V output swing, and features dedicated offset nulling pins (1 & 8) for fine-tuning in high-accuracy DAQ and ADC driver circuits.
For engineers reviewing the THS4031ID datasheet, THS4031ID pinout, THS4031ID application, or THS4031ID equivalent, this page provides verified specifications, SOIC-8 and HVSSOP-8 package details, real-world use cases in SAR ADC buffering and ultrasound front-ends, and two validated alternative op-amps with documented functional trade-offs.
Technical Context
The THS4031ID employs a complementary bipolar 30V process with GHz fT transistors, enabling voltage-feedback architecture with unity-gain stability (120MHz bandwidth) and 70ns 0.1% settling time. Its internal compensation prioritizes bandwidth and slew rate but requires external isolation resistors (>20Ω) when driving capacitive loads >10pF to maintain phase margin.
It operates from ±4.5V to ±16V dual supplies (or 9–32V single supply), supports rail-to-rail input common-mode range (±14.3V at ±15V), and integrates offset nulling capability via pins 1 and 8-unique among the THS403x family and absent in the dual-channel THS4032.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3dB) | 100MHz at G = 2; enables faithful amplification of signals up to video and ultrasound baseband frequencies without attenuation. |
| Slew Rate | 100V/μs; supports clean reproduction of fast transient signals (e.g., 20V step in 200ns) without slewing distortion. |
| Voltage Noise | 1.2nV/√Hz (f > 10kHz); critical for preserving SNR in low-level sensor interfaces and high-resolution ADC drivers. |
| THD @ 1MHz | –96dBc (RL = 1kΩ); ensures minimal harmonic contamination in precision analog signal chains like DAQ systems. |
| Output Drive | 200mA (typical); drives heavy loads including 150Ω video lines or capacitive ADC inputs without gain compression. |
| Input Offset Voltage | 0.3mV (typical); reduces DC error in closed-loop configurations; adjustable to near-zero via external potentiometer on pins 1/8. |
| Supply Range | ±4.5V to ±16V; accommodates industrial ±5V, ±12V, and ±15V rails while maintaining full dynamic range. |
Pinout & Package
THS4031ID is available in two surface-mount packages: 8-pin SOIC (D package, 4.9mm × 6mm) and 8-pin HVSSOP (DGN package, 3.0mm × 4.9mm), both with exposed thermal pad (HVSSOP only). Pin functions are identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 NULL | Offset null adjust input | Connect external 10kΩ potentiometer wiper to VCC– to actively trim input offset voltage - unique to THS4031ID. |
| 2 IN– | Inverting input | Differential input node; used in inverting gain configurations and feedback networks. |
| 3 IN+ | Noninverting input | Differential input node; accepts high-impedance signal sources with 2MΩ input resistance. |
| 4 VCC– | Negative power supply | Reference for internal biasing; must be stable and low-noise; connects to ground in single-supply operation. |
| 5 NC | No connection | Internally unconnected; leave floating or tie to ground per layout best practices to reduce noise coupling. |
| 6 OUT | Amplifier output | Capable of ±13.6V swing into 1kΩ; requires series resistor ≥20Ω when driving >10pF capacitance. |
| 7 VCC+ | Positive power supply | Reference for internal biasing; decouple with 0.1μF ceramic capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low voltage noise | 1.2nV/√Hz enables high-fidelity amplification of microvolt-level sensor outputs without degrading system SNR. |
| Offset nulling capability | Pins 1 & 8 allow sub-100μV offset correction - essential for DC-coupled precision instrumentation and calibration circuits. |
| High slew rate + bandwidth | 100V/μs + 100MHz allows simultaneous handling of large-signal transients and wideband content (e.g., ultrasound pulses). |
| Low THD into high-Z load | –96dBc @ 1MHz, RL = 1kΩ minimizes harmonic artifacts in audio, spectrum analysis, and RF sampling front-ends. |
| Robust output drive | 200mA output current supports direct driving of coaxial cables, ADC reference buffers, and active filter stages. |
Applications
| ADC Driver for 16-bit SAR Converters | Ultrasound Signal Conditioning |
|---|---|
Use Scenario: Buffering and driving the analog input of high-speed 16-bit SAR ADCs (e.g., ADS8422) with 8VPP signals and 0V common-mode. IC Role / Device Role / Timing Role: High-fidelity voltage follower and level shifter; maintains signal integrity during acquisition window with <70ns settling to 0.1%. Use Value: Preserves ENOB by minimizing noise addition (1.2nV/√Hz) and distortion (–96dBc), directly enabling >15.5 effective bits at 1MHz. |
Use Scenario: Amplifying low-amplitude, wideband echo signals (1–15MHz) from piezoelectric transducers in portable ultrasound scanners. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth gain stage preceding programmable gain amplifier (PGA) and ADC; handles fast pulse returns with minimal ringing. Use Value: 100MHz bandwidth and 100V/μs slew rate resolve fine tissue structures; –96dBc THD prevents harmonic misinterpretation as anatomical features. |
| Video Line Driver | Active Filter Building Block |
Use Scenario: Driving 75Ω coaxial video lines (NTSC/PAL) in broadcast equipment and medical imaging displays. IC Role / Device Role / Timing Role: Current-boosting buffer with precise differential gain/phase matching; configured as unity-gain follower or gain-of-2. Use Value: 0.015% differential gain error and 0.025° phase error at ±15V ensure color fidelity and timing accuracy in composite video signals. |
Use Scenario: Implementing high-Q, low-drift Sallen-Key and multiple-feedback active filters in test equipment and communications receivers. IC Role / Device Role / Timing Role: Stable, low-noise gain element in 2nd-order low-pass topologies; bandwidth ~10× filter cutoff for linear phase response. Use Value: Unity-gain stability (120MHz) and low input capacitance (1.5pF) prevent peaking and preserve filter transfer function accuracy up to 10MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA656IDBVR | Lower noise (0.95nV/√Hz), lower bandwidth (500MHz), no offset null pins, higher supply current (12.5mA). | Better for RF/IF gain stages requiring >200MHz small-signal BW; unsuitable where active offset trimming is required. | Select OPA656IDBVR when absolute lowest noise dominates and offset drift is managed digitally or via calibration. |
| LMH6629MA/NOPB | Higher noise (1.9nV/√Hz), same bandwidth (100MHz), no offset null, higher slew rate (1300V/μs), wider supply (±2.5V to ±6V). | Better for ultra-fast pulse amplification (e.g., LIDAR); incompatible with ±15V industrial rails due to 12V max supply. | Select LMH6629MA/NOPB only for low-voltage, high-slew applications where noise penalty is acceptable and offset adjustment is unnecessary. |
Compared with OPA656IDBVR and LMH6629MA/NOPB, THS4031ID uniquely balances ultra-low noise, 100MHz bandwidth, ±16V operation, and hardware-adjustable offset - making it the only choice among the three for ±15V DAQ systems requiring sub-mV DC accuracy and wideband fidelity.
Availability
THS4031ID is available at Aetrix Electronics and suitable for high-precision data acquisition (DAQ), ultrasound front-end modules, and video line driver designs requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for THS4031ID includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with over 50 years of innovation in high-performance op-amps and precision signal-chain solutions.
The THS403x product line was designed specifically for demanding analog signal conditioning in communications infrastructure, medical imaging, and test equipment - emphasizing low noise, high speed, and robust output drive in a single/dual configuration.
FAQ
What is the maximum supply voltage for THS4031ID?
The THS4031ID supports dual-supply operation from ±4.5V to ±16V (32V total), with absolute maximum rating of ±16.5V. Exceeding ±16V risks permanent damage per Section 5.1 Absolute Maximum Ratings. For single-supply use, the device operates from 9V to 32V, with VCC– tied to ground.
Does THS4031ID require external compensation for stability?
No - THS4031ID is internally compensated and unity-gain stable (120MHz bandwidth). However, when driving capacitive loads >10pF, an external series isolation resistor (≥20Ω) must be placed between the OUT pin and the load to prevent phase-margin degradation and potential oscillation, as specified in Section 7.1.1.
How do I use the NULL pins (1 and 8) on THS4031ID?
Connect a 10kΩ potentiometer between pins 1 and 8, with its wiper tied to VCC– (negative supply). Adjusting the potentiometer changes the internal bias current balance, allowing manual reduction of input offset voltage to <100μV - a feature exclusive to THS4031ID and not present on THS4032.
What is the typical THD performance of THS4031ID at 1MHz?
THS4031ID achieves –96dBc total harmonic distortion at 1MHz with G = 2, RL = 1kΩ, and VO(pp) = 2V (Section 5.7). This value improves to –81dBc under heavier 150Ω loading, reflecting its optimized drive capability for video and cable applications.
Can THS4031ID drive a 75Ω video line directly?
Yes - THS4031ID delivers 200mA output current and ±13.6V swing into 1kΩ, enabling direct 75Ω driving when configured with appropriate gain and series termination. Data Sheet Section 5.6 confirms 0.015% differential gain and 0.025° phase error at ±15V, meeting NTSC/PAL broadcast requirements.
THS4031ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 100V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 MHz
- Current - Input Bias:
- 3 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 8.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4031ID FAQ
1.How can I place an order for THS4031ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4031ID on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for THS4031ID reliable?
The price and inventory of THS4031ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4031ID is usually 5 days.
3.What payment methods are accepted for THS4031ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4031ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4031ID?
THS4031ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4031ID order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for THS4031ID?
For technical support, including THS4031ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4031ID requirements.
6.How does Aetrix verify that THS4031ID is sourced from the original manufacturer or authorized distributors?
All THS4031ID products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that THS4031ID meets industry standards.
7.What is the process for return or replacement of THS4031ID?
All THS4031ID units undergo pre-shipment inspection (PSI). If there is an issue with THS4031ID, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The THS4031ID part is unused and in its original packaging.
Return procedure for THS4031ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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